intercept form closing

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Alexander Stetsenko - 04 Jun 2007 10:41 GMT

Hi.

What I need is to intercept MDI Parent form closing.

As for now, MDI Parent form closing event is rased only after all child
forms are closed.
And I can't cancel this operation. If user had accidentaly clicked form X
close button
I want to ask him if hi realy want to close thw application. BEFORE all
opened child windows
are closed.

How can I do this?

Thanks.
Alexander.

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Manish Bafna - 04 Jun 2007 11:21 GMT

Hi,
You can give users the option to change their minds by handling the
FormClosing event and setting FormClosingEventArgs.Cancel to true or false as
appropriate:
//if we set e.cancel to true means it will not close the application
void Form1_FormClosing(object sender, FormClosingEventArgs e) {
if( e.CloseReason == CloseReason.UserClosing){
DialogResult result = MessageBox.Show(
"Abort your application?", "Application In Progress",
MessageBoxButtons.YesNo);
e.Cancel = (result == DialogResult.No);
}
}

Signature

Hope this helps.
Thanks and Regards.
Manish Bafna.
MCP and MCTS.

> Hi.
>
[quoted text clipped - 12 lines]
> Thanks.
> Alexander.

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Alexander Stetsenko - 04 Jun 2007 11:49 GMT

It will work if FormClosing event fire before Closing (and before closing
all child windows)
But if is fired after Closing event. So it can't help me. All child windows
at that moment are closed :(

Other solutions?

> Hi,
> You can give users the option to change their minds by handling the
[quoted text clipped - 27 lines]
>> Thanks.
>> Alexander.

Reply to this Message

-pb- - 04 Jun 2007 12:23 GMT

On 4 Jun, 11:49, "Alexander Stetsenko" <alexan...@NOSPAMcosmoset.com>
wrote:

> It will work if FormClosing event fire before Closing (and before closing
> all child windows)
[quoted text clipped - 41 lines]
>
> - Show quoted text -

try following code. It works for me. No matter whether how many child
windows are open. Trap FormClosing event and not FormClosed event. You
can put additional loginc in If to check if any child window is
visible ot not and if not then don't ask any question.

private void MDIParent1_FormClosing(object sender,
FormClosingEventArgs e)
{
if (MessageBox.Show("Close?",
AppDomain.CurrentDomain.ToString(), MessageBoxButtons.YesNo) ==
DialogResult.No)
{
e.Cancel = true;
}
}

This is definatly working for me as we had recently deliver one of our
project to client with simillar feature

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Mehdi - 04 Jun 2007 12:10 GMT

> What I need is to intercept MDI Parent form closing.
>
[quoted text clipped - 7 lines]
>
> How can I do this?

It's been a long time since I've worked with MDI windows but what about
overriding the WndProc method and intercepting whatever message is posted
when the user clicks on the close button there?

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Alexander Stetsenko - 04 Jun 2007 12:49 GMT

Thanks all!

Your solutions works fine.

I found the problem. It is Janus MdiTab Manager. Without it the sequence of
events is correct and
FormClosing is works fine. But the I activate it all child forms closes
before I enter any of form closing event handlers.

Thanks again.

> Hi.
>
[quoted text clipped - 12 lines]
> Thanks.
> Alexander.

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Peter Duniho - 04 Jun 2007 17:12 GMT

> I found the problem. It is Janus MdiTab Manager. Without it the sequence
> of events is correct and
> FormClosing is works fine. But the I activate it all child forms closes
> before I enter any of form closing event handlers.

Is the Janus component part of the inheritance chain for your form? Or is
it simply adding an event handler to the FormClosing event? Either way,
it seems to me that this is an example of why it's a good idea to override
the OnFormClosing() method in your form, rather than to subscribe to its
own event. If you override the OnFormClosing() method, you can ensure
that your code is executed first, before any base class and before any
event handlers. You can even avoid calling any of that other code if you
don't need to (if canceling the close, for example).

Pete

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Alexander Stetsenko - 05 Jun 2007 06:57 GMT

It's a component, placed on form.
I've already tried to override OnFormClosing, but with no success.
It seems like this component handling Windows messages directly.

Reply to this Message

Peter Duniho - 05 Jun 2007 09:09 GMT

> It's a component, placed on form.
> I've already tried to override OnFormClosing, but with no success.
> It seems like this component handling Windows messages directly.

I don't see how it can do that, unless it's doing some low-level message
hooks or something. That's certainly not the sort of behavior I'd expect
from a .NET Forms component. Sounds like a good reason not to use that
component if it can be helped. :)

Pete

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